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Method for recording of data related to malfunctions of a vehicle

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention relates to a method for obtaining and recording of data related to malfunctions of different systems and control units of a vehicle, such as a truck, during tests thereof. The invention is based on the idea of using error codes instead of thresholds for sensor or parameter values for initiating or triggering the recording of data.

Country

Undisclosed

Language

English (United States)

This text was extracted from a Microsoft Word document.

This is the abbreviated version, containing approximately
39% of the total text.

Method for recording
of data related to malfunctions of a vehicle

Technical
field of the invention

The present invention
relates to a method for obtaining and recording of data related to malfunctions
of different systems and control units of a vehicle, such as a truck, during
tests thereof.

Background
of the invention

During the
development of a new vehicle, such as a truck, a number of different tests are
performed including field runs where, the truck is tested under real conditions,
and simulated runs, where the different systems of the truck is tested in the
lab, for example, the engine control unit, which comprises the software
controlling the internal combustion engine of the truck. The purposes with
these tests are, for example, to evaluate whether the different functions of
the control systems of the truck fulfils pre-defined performance requirements, or
to evaluate the durability of different parts or subsystems of the systems,
such as temperature sensors and pressure sensors. During these tests the test
data related to the functions and/or features of the truck are recorded and
stored in a memory unit located, for example, in a PC connected to the control
unit by means of a data collection program. Thereafter, the recorded data is
viewed and evaluated by development engineer
in order to locate malfunctions and/or sources of errors. However, this
procedure will be very time-consuming if the recorded data is not limited in
some way since, for example, a field run can last for about 4 hours and the amount
of data produced will consequently be very extensive.

To this
end, trigger events that initiate or trigger the recording of the data have
been introduced in the data collection programs used today. Traditionally, a
trigger event has been the crossing of
a threshold for the different sensor or variable values of the systems of the
truck. As an example, a lower threshold and a higher threshold for the voltage
of a temperature sensor of the engine. In this case, the recording of the data
related to the temperature sensor, i.e. the voltage of the sensor or the
sensing value, is initiated when the program is notified that the voltage of
the temperature sensor has exceeded the higher threshold or has fallen below
the lower threshold. This procedure can be beneficial when the source of error
is well-defined or known, i.e. which variable that gives rise to a specific
error. However, if the source of error is not specifically associated with a
variable, not known, or where it can be multiple sources, this procedure for
initiating the recording of data will not be suitable. Accordingly, there is a
need for an improved method for obtaining or recording data related to
functions and control units of vehicles, such as trucks, during tests thereof that
produces a manageable amount of data and that is able to obtain data related to
errors where the source is unknown or where there can be multiple sources of
error.